--- main.c.org	Tue Feb 11 17:35:35 2003
+++ main.c	Tue Feb 11 18:09:22 2003
@@ -39,6 +39,7 @@
 
 
 #include "lsof.h"
+#include <sys/systemcfg.h>
 
 
 /*
@@ -89,6 +90,25 @@
 	    Pn++;
 	else
 	    Pn = argv[0];
+
+/*
+ * Only use this if we know this has been built for 32bit kernel,
+ * and we are potentially executing this with a 64bit kernel.
+ * Assumes a 64-bit version is available as "lsof64" to execute in
+ * place of this 32-bit default.
+ * This is pretty specific to the AIX Toolbox build.
+ */
+#if     defined(CHECK_KERN64)
+	if ( (strcmp(Pn, "lsof64")) && (__KERNEL_64()) ) {
+	  /* This is a not lsof64, but it is a 64-bit kernel.  The current
+	   * lsof will not work.  Attempt to exec "lsof64" instead.
+	   */
+	  execvp ("/opt/freeware/sbin/lsof64", argv); 
+	  perror(Pn);
+	  (void) fprintf(stderr, "Could not exec /opt/freeware/sbin/lsof64\n");
+	  Exit(1);
+	}
+#endif
 
 #if	defined(HASSETLOCALE)
 /*